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Math Help - finding the vertex

  1. #1
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    finding the vertex

    I am stuck...please help.

    Here is the equation: y=-2x^2+24x-70
    find the y intercept
    find the x intercept
    find the vertex
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by getnaphd View Post
    I am stuck...please help.

    Here is the equation: y=-2x^2+24x-70
    find the y intercept
    find the x intercept
    find the vertex
    the x-value for the vertex is given by: x = \frac {-b}{2a}

    where a is the coefficient of x^2, b is the coefficient of x and c is the constant term. then you plug in whatever value you get for x to find the corresponding y-value, so you can get the coordinate point for the vertex

    i suppose you have no problems with finding the intercepts?

    for x-intercept, replace y with zero and solve for x

    for y-intercept, replace x with zero and solve for y
    Last edited by Jhevon; September 7th 2008 at 03:28 PM. Reason: forgot to say what a was :p
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